#include "rutil/ResipAssert.h"

#include <rutil/Data.hxx>
#include <rutil/Socket.hxx>
#include <resip/stack/Symbols.hxx>
#include <rutil/TransportType.hxx>
#include <rutil/Logger.hxx>
#include <resip/stack/Tuple.hxx>
#include <rutil/DnsUtil.hxx>
#include <rutil/ParseBuffer.hxx>

#include "Version.hxx"
#include "AppSubsystem.hxx"
#include "Server.hxx"
#include "XmlRpcServerBase.hxx"
#include "XmlRpcConnection.hxx"

using namespace clicktocall;
using namespace resip;
using namespace std;

#define RESIPROCATE_SUBSYSTEM AppSubsystem::CLICKTOCALL

unsigned int XmlRpcConnection::NextConnectionId = 1;


XmlRpcConnection::XmlRpcConnection(XmlRpcServerBase& server, resip::Socket sock):
   mXmlRcpServer(server),
   mConnectionId(NextConnectionId++),
   mNextRequestId(1),
   mSock(sock)
{
	resip_assert(mSock > 0);
}


XmlRpcConnection::~XmlRpcConnection()
{
   resip_assert(mSock > 0);
#ifdef WIN32
   closesocket(mSock); 
#else
   close(mSock);
#endif
   mSock=0;
}

      
void 
XmlRpcConnection::buildFdSet(FdSet& fdset)
{
   if (!mTxBuffer.empty())
   {
      fdset.setWrite(mSock);
   }
   fdset.setRead(mSock);
}


bool 
XmlRpcConnection::process(FdSet& fdset)
{
   if (fdset.hasException(mSock))
   {
      int errNum = 0;
      int errNumSize = sizeof(errNum);
      getsockopt(mSock,SOL_SOCKET,SO_ERROR,(char *)&errNum,(socklen_t *)&errNumSize);
      InfoLog (<< "XmlRpcConnection::process: Exception reading from socket " 
               << (int)mSock << " code: " << errNum << "; closing connection");
      return false;
   }
   
   if (fdset.readyToRead(mSock))
   {
      bool ok = processSomeReads();
      if (!ok)
      {
         return false;
      }
   }
   if ((!mTxBuffer.empty()) && fdset.readyToWrite(mSock))
   {
      bool ok = processSomeWrites();
      if (!ok)
      {
         return false;
      }
   }

   return true;
}

bool
XmlRpcConnection::processSomeReads()
{
   const int bufSize = 8000;
   char buf[bufSize];
   
 
#if defined(WIN32)
   int bytesRead = ::recv(mSock, buf, bufSize, 0);
#else
   int bytesRead = ::read(mSock, buf, bufSize);
#endif

   if (bytesRead == INVALID_SOCKET)
   {
      int e = getErrno();
      XmlRpcServerBase::logSocketError(e);
      InfoLog (<< "XmlRpcConnection::processSomeReads: Failed read on " << (int)mSock);
      return false;
   }
   else if(bytesRead == 0)
   {
      InfoLog (<< "XmlRpcConnection::processSomeReads: Connection closed by remote");
      return false;
   }

   //DebugLog (<< "XmlRpcConnection::processSomeReads: read=" << bytesRead);            

   mRxBuffer += Data( buf, bytesRead );
   
   while(tryParse());
   
   return true;
}


bool 
XmlRpcConnection::tryParse()
{
   ParseBuffer pb(mRxBuffer);
   Data initialTag;
   const char* start = pb.position();
   pb.skipWhitespace();
   pb.skipToChar('<');   
   if(!pb.eof())
   {
      pb.skipChar();
      const char* anchor = pb.position();
      pb.skipToChar('>');
      if(!pb.eof())
      {
         initialTag = pb.data(anchor);
         // Find end of initial tag
         pb.skipToChars("</" + initialTag + ">");
         if (!pb.eof())
         {
            pb.skipN(initialTag.size() + 3);  // Skip past </InitialTag>
            mRequests[mNextRequestId] = pb.data(start);
            mXmlRcpServer.handleRequest(mConnectionId, mNextRequestId, mRequests[mNextRequestId]);
            mNextRequestId++;

            // Remove processed data from RxBuffer
            pb.skipWhitespace();
            if(!pb.eof())
            {
               anchor = pb.position();
               pb.skipToEnd();
               mRxBuffer = pb.data(anchor);
               return true;
            }
            else
            {
               mRxBuffer.clear();
            }
         }   
      }
   }
   return false;
}


bool
XmlRpcConnection::processSomeWrites()
{
   if (mTxBuffer.empty())
   {
      return true;
   }
   
   //DebugLog (<< "XmlRpcConnection::processSomeWrites: Writing " << mTxBuffer );

#if defined(WIN32)
   int bytesWritten = ::send(mSock, mTxBuffer.data(), (int)mTxBuffer.size(), 0);
#else
   int bytesWritten = ::write(mSock, mTxBuffer.data(), mTxBuffer.size() );
#endif

   if (bytesWritten == INVALID_SOCKET)
   {
      int e = getErrno();
      XmlRpcServerBase::logSocketError(e);
      InfoLog (<< "XmlRpcConnection::processSomeWrites - failed write on " << mSock << " " << strerror(e));

      return false;
   }
   
   if (bytesWritten == (int)mTxBuffer.size())
   {
      DebugLog (<< "XmlRpcConnection::processSomeWrites - Wrote it all" );
      mTxBuffer = Data::Empty;

      //return false; // return false causes connection to close and clean up
      return true;  // keep connection up
   }
   else
   {
      Data rest = mTxBuffer.substr(bytesWritten);
      mTxBuffer = rest;
      DebugLog( << "XmlRpcConnection::processSomeWrites - Wrote " << bytesWritten << " bytes - still need to do " << mTxBuffer );
   }
   
   return true;
}

bool
XmlRpcConnection::sendResponse(unsigned int requestId, const Data& responseData, bool isFinal)
{
   RequestMap::iterator it = mRequests.find(requestId);
   if(it != mRequests.end())
   {
      Data& request = it->second;
      Data response(request.size() + responseData.size() + 30, Data::Preallocate);
      ParseBuffer pb(request);

      // A response is formed by starting with the request and inserting the 
      // ResponseData between <Response> tags at the same level as the <Request> tags
      const char* start = pb.position();      
      pb.skipToChars("</Request>");
      if (!pb.eof())
      {
         pb.skipN(10);  // Skip past </Request>
         pb.skipWhitespace();
   
         // Response starts with request message up to end of Request tag
         response = pb.data(start);
   
         // Add in response data
         response += Symbols::CRLF;
         response += "  <Response>" + responseData + "  </Response>";
         response += Symbols::CRLF;

         // Add remainder of request message
         start = pb.position();
         pb.skipToEnd();
         response += pb.data(start);
      }
      else
      {
         // No Request in message - just send bare response
         response = "<Response>" + responseData + "</Response>";
      }
      mTxBuffer += response;
      if(isFinal)
      {
          mRequests.erase(it);
      }
      return true;
   }
   return false;
}


/* ====================================================================

 Copyright (c) 2009, SIP Spectrum, Inc.
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are 
 met:

 1. Redistributions of source code must retain the above copyright 
    notice, this list of conditions and the following disclaimer. 

 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution. 

 3. Neither the name of SIP Spectrum nor the names of its contributors 
    may be used to endorse or promote products derived from this 
    software without specific prior written permission. 

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 ==================================================================== */

